char *select_image(char *image)
/* Look image up on the filesystem, if it is a file then we're done, but
* if its a directory then we want the newest file in that directory. If
* it doesn't exist at all, then see if it is 'number:number' and get the
* image from that absolute offset off the disk.
*/
{
ino_t image_ino;
struct stat st;
image= strcpy(malloc((strlen(image) + 1 + NAME_MAX + 1)
* sizeof(char)), image);
fsok= r_super(&block_size) != 0;
if (!fsok || (image_ino= r_lookup(ROOT_INO, image)) == 0) {
char *size;
if (numprefix(image, &size) && *size++ == ':'
&& numeric(size)) {
vir2sec= flat_vir2sec;
image_off= a2l(image);
image_sectors= a2l(size);
strcpy(image, "Minix");
return image;
}
if (!fsok)
printf("No image selected\n");
else
printf("Can't load %s: %s\n", image, unix_err(errno));
goto bail_out;
}
r_stat(image_ino, &st);
image_bytes = st.st_size;
if (!S_ISREG(st.st_mode)) {
char *version= image + strlen(image);
char dots[NAME_MAX + 1];
if (!S_ISDIR(st.st_mode)) {
printf("%s: %s\n", image, unix_err(ENOTDIR));
goto bail_out;
}
(void) r_readdir(dots);
(void) r_readdir(dots); /* "." & ".." */
*version++= '/';
*version= 0;
if ((image_ino= latest_version(version, &st)) == 0) {
printf("There are no images in %s\n", image);
goto bail_out;
}
r_stat(image_ino, &st);
}
vir2sec= file_vir2sec;
image_sectors= (st.st_size + SECTOR_SIZE - 1) >> SECTOR_SHIFT;
return image;
bail_out:
free(image);
return nil;
}
void exec_image(char *image)
/* Get a Minix image into core, patch it up and execute. */
{
int i;
struct image_header hdr;
char *buf;
u32_t vsec, addr, limit, aout, n, totalmem = 0;
struct process *procp; /* Process under construction. */
long a_text, a_data, a_bss, a_stack;
int banner= 0;
long processor= a2l(b_value("processor"));
u16_t kmagic, mode;
char *console;
char params[SECTOR_SIZE];
extern char *sbrk(int);
char *verb;
/* The stack is pretty deep here, so check if heap and stack collide. */
(void) sbrk(0);
if ((verb= b_value(VERBOSEBOOTVARNAME)) != nil)
verboseboot = a2l(verb);
printf("\nLoading ");
pretty_image(image);
printf(".\n");
vsec= 0; /* Load this sector from image next. */
addr= mem[0].base; /* Into this memory block. */
limit= mem[0].base + mem[0].size;
if (limit > caddr) limit= caddr;
/* Allocate and clear the area where the headers will be placed. */
aout = (limit -= PROCESS_MAX * A_MINHDR);
/* Clear the area where the headers will be placed. */
raw_clear(aout, PROCESS_MAX * A_MINHDR);
/* Read the many different processes: */
for (i= 0; vsec < image_size; i++) {
u32_t startaddr;
startaddr = addr;
if (i == PROCESS_MAX) {
printf("There are more then %d programs in %s\n",
PROCESS_MAX, image);
errno= 0;
return;
}
procp= &process[i];
/* Read header. */
DEBUGEXTRA(("Reading header... "));
for (;;) {
if ((buf= get_sector(vsec++)) == nil) return;
memcpy(&hdr, buf, sizeof(hdr));
if (BADMAG(hdr.process)) { errno= ENOEXEC; return; }
/* Check the optional label on the process. */
if (selected(hdr.name)) break;
/* Bad label, skip this process. */
vsec+= proc_size(&hdr);
}
DEBUGEXTRA(("done\n"));
/* Sanity check: an 8086 can't run a 386 kernel. */
if (hdr.process.a_cpu == A_I80386 && processor < 386) {
printf("You can't run a 386 kernel on this 80%ld\n",
processor);
errno= 0;
return;
}
/* Get the click shift from the kernel text segment. */
if (i == KERNEL_IDX) {
if (!get_clickshift(vsec, &hdr)) return;
addr= align(addr, click_size);
/* big kernels must be loaded into extended memory */
if (k_flags & K_KHIGH) {
addr= mem[1].base;
limit= mem[1].base + mem[1].size;
}
}
/* Save a copy of the header for the kernel, with a_syms
* misused as the address where the process is loaded at.
*/
DEBUGEXTRA(("raw_copy(0x%x, 0x%lx, 0x%x)... ",
aout + i * A_MINHDR, mon2abs(&hdr.process), A_MINHDR));
hdr.process.a_syms= addr;
raw_copy(aout + i * A_MINHDR, mon2abs(&hdr.process), A_MINHDR);
DEBUGEXTRA(("done\n"));
if (!banner) {
DEBUGBASIC((" cs ds text data bss"));
if (k_flags & K_CHMEM) DEBUGBASIC((" stack"));
DEBUGBASIC(("\n"));
banner= 1;
}
/* Segment sizes. */
DEBUGEXTRA(("a_text=0x%lx; a_data=0x%lx; a_bss=0x%lx; a_flags=0x%x)\n",
hdr.process.a_text, hdr.process.a_data,
hdr.process.a_bss, hdr.process.a_flags));
a_text= hdr.process.a_text;
a_data= hdr.process.a_data;
a_bss= hdr.process.a_bss;
if (k_flags & K_CHMEM) {
a_stack= hdr.process.a_total - a_data - a_bss;
if (!(hdr.process.a_flags & A_SEP)) a_stack-= a_text;
} else {
a_stack= 0;
}
/* Collect info about the process to be. */
procp->cs= addr;
/* Process may be page aligned so that the text segment contains
* the header, or have an unmapped zero page against vaxisms.
*/
procp->entry= hdr.process.a_entry;
if (hdr.process.a_flags & A_PAL) a_text+= hdr.process.a_hdrlen;
if (hdr.process.a_flags & A_UZP) procp->cs-= click_size;
/* Separate I&D: two segments. Common I&D: only one. */
if (hdr.process.a_flags & A_SEP) {
/* Read the text segment. */
DEBUGEXTRA(("get_segment(0x%lx, 0x%lx, 0x%lx, 0x%lx)\n",
vsec, a_text, addr, limit));
if (!get_segment(&vsec, &a_text, &addr, limit)) return;
DEBUGEXTRA(("get_segment done vsec=0x%lx a_text=0x%lx "
"addr=0x%lx\n",
vsec, a_text, addr));
/* The data segment follows. */
procp->ds= addr;
if (hdr.process.a_flags & A_UZP) procp->ds-= click_size;
procp->data= addr;
} else {
/* Add text to data to form one segment. */
procp->data= addr + a_text;
procp->ds= procp->cs;
a_data+= a_text;
}
/* Read the data segment. */
DEBUGEXTRA(("get_segment(0x%lx, 0x%lx, 0x%lx, 0x%lx)\n",
vsec, a_data, addr, limit));
if (!get_segment(&vsec, &a_data, &addr, limit)) return;
DEBUGEXTRA(("get_segment done vsec=0x%lx a_data=0x%lx "
"addr=0x%lx\n",
vsec, a_data, addr));
/* Make space for bss and stack unless... */
if (i != KERNEL_IDX && (k_flags & K_CLAIM)) a_bss= a_stack= 0;
DEBUGBASIC(("%07lx %07lx %8ld %8ld %8ld",
procp->cs, procp->ds, hdr.process.a_text,
hdr.process.a_data, hdr.process.a_bss));
if (k_flags & K_CHMEM) DEBUGBASIC((" %8ld", a_stack));
/* Note that a_data may be negative now, but we can look at it
* as -a_data bss bytes.
*/
/* Compute the number of bss clicks left. */
a_bss+= a_data;
n= align(a_bss, click_size);
a_bss-= n;
/* Zero out bss. */
DEBUGEXTRA(("\nraw_clear(0x%lx, 0x%lx); limit=0x%lx... ", addr, n, limit));
if (addr + n > limit) { errno= ENOMEM; return; }
raw_clear(addr, n);
DEBUGEXTRA(("done\n"));
addr+= n;
/* And the number of stack clicks. */
a_stack+= a_bss;
n= align(a_stack, click_size);
a_stack-= n;
/* Add space for the stack. */
addr+= n;
/* Process endpoint. */
procp->end= addr;
if (verboseboot >= VERBOSEBOOT_BASIC)
printf(" %s\n", hdr.name);
else {
u32_t mem;
mem = addr-startaddr;
printf("%s ", hdr.name);
totalmem += mem;
}
if (i == 0 && (k_flags & (K_HIGH | K_KHIGH)) == K_HIGH) {
/* Load the rest in extended memory. */
addr= mem[1].base;
limit= mem[1].base + mem[1].size;
}
}
if (verboseboot < VERBOSEBOOT_BASIC)
printf("(%dk)\n", totalmem/1024);
if ((n_procs= i) == 0) {
printf("There are no programs in %s\n", image);
errno= 0;
return;
}
/* Check the kernel magic number. */
raw_copy(mon2abs(&kmagic),
process[KERNEL_IDX].data + MAGIC_OFF, sizeof(kmagic));
if (kmagic != KERNEL_D_MAGIC) {
printf("Kernel magic number is incorrect (0x%x@0x%lx)\n",
kmagic, process[KERNEL_IDX].data + MAGIC_OFF);
errno= 0;
return;
}
/* Patch sizes, etc. into kernel data. */
DEBUGEXTRA(("patch_sizes()... "));
patch_sizes();
DEBUGEXTRA(("done\n"));
#if !DOS
if (!(k_flags & K_MEML)) {
/* Copy the a.out headers to the old place. */
raw_copy(HEADERPOS, aout, PROCESS_MAX * A_MINHDR);
}
#endif
/* Run the trailer function just before starting Minix. */
DEBUGEXTRA(("run_trailer()... "));
if (!run_trailer()) { errno= 0; return; }
DEBUGEXTRA(("done\n"));
/* Translate the boot parameters to what Minix likes best. */
DEBUGEXTRA(("params2params(0x%x, 0x%x)... ", params, sizeof(params)));
if (!params2params(params, sizeof(params))) { errno= 0; return; }
DEBUGEXTRA(("done\n"));
/* Set the video to the required mode. */
if ((console= b_value("console")) == nil || (mode= a2x(console)) == 0) {
mode= strcmp(b_value("chrome"), "color") == 0 ? COLOR_MODE :
MONO_MODE;
}
DEBUGEXTRA(("set_mode(%d)... ", mode));
set_mode(mode);
DEBUGEXTRA(("done\n"));
/* Close the disk. */
DEBUGEXTRA(("dev_close()... "));
(void) dev_close();
DEBUGEXTRA(("done\n"));
/* Minix. */
DEBUGEXTRA(("minix(0x%lx, 0x%lx, 0x%lx, 0x%x, 0x%x, 0x%lx)\n",
process[KERNEL_IDX].entry, process[KERNEL_IDX].cs,
process[KERNEL_IDX].ds, params, sizeof(params), aout));
minix(process[KERNEL_IDX].entry, process[KERNEL_IDX].cs,
process[KERNEL_IDX].ds, params, sizeof(params), aout);
if (!(k_flags & K_BRET)) {
extern u32_t reboot_code;
raw_copy(mon2abs(params), reboot_code, sizeof(params));
}
parse_code(params);
/* Return from Minix. Things may have changed, so assume nothing. */
fsok= -1;
errno= 0;
/* Read leftover character, if any. */
scan_keyboard();
/* Restore screen contents. */
restore_screen();
}
void exec_mb(char *kernel, char* modules)
/* Get a Minix image into core, patch it up and execute. */
{
int i;
static char hdr[SECTOR_SIZE];
char *buf;
u32_t vsec, addr, limit, n, totalmem = 0;
u16_t kmagic, mode;
char *console;
char params[SECTOR_SIZE];
extern char *sbrk(int);
char *verb;
u32_t text_vaddr, text_paddr, text_filebytes, text_membytes;
u32_t data_vaddr, data_paddr, data_filebytes, data_membytes;
u32_t pc;
u32_t text_offset, data_offset;
i32_t segsize;
int r;
u32_t cs, ds;
char *modstring, *mod;
multiboot_info_t *mbinfo;
multiboot_module_t *mbmodinfo;
u32_t mbinfo_size, mbmodinfo_size;
char *memvar;
memory *mp;
u32_t mod_cmdline_start, kernel_cmdline_start;
u32_t modstringlen;
int modnr;
/* The stack is pretty deep here, so check if heap and stack collide. */
(void) sbrk(0);
if ((verb= b_value(VERBOSEBOOTVARNAME)) != nil)
verboseboot = a2l(verb);
printf("\nLoading %s\n", kernel);
vsec= 0; /* Load this sector from kernel next. */
addr= mem[0].base; /* Into this memory block. */
limit= mem[0].base + mem[0].size;
if (limit > caddr) limit= caddr;
/* set click size for get_segment */
click_size = PAGE_SIZE;
k_flags = K_KHIGH|K_BRET|K_MEML|K_INT86|K_RET|K_HDR
|K_HIGH|K_CHMEM|K_I386;
/* big kernels must be loaded into extended memory */
addr= mem[1].base;
limit= mem[1].base + mem[1].size;
/* Get first sector */
DEBUGEXTRA(("get_sector\n"));
if ((buf= get_sector(vsec++)) == nil) {
DEBUGEXTRA(("get_sector failed\n"));
return;
}
memcpy(hdr, buf, SECTOR_SIZE);
/* Get ELF header */
DEBUGEXTRA(("read_header_elf\n"));
r = read_header_elf(hdr, &text_vaddr, &text_paddr,
&text_filebytes, &text_membytes,
&data_vaddr, &data_paddr,
&data_filebytes, &data_membytes,
&pc, &text_offset, &data_offset);
if (r < 0) { errno= ENOEXEC; return; }
/* Read the text segment. */
addr = text_paddr;
segsize = (i32_t) text_filebytes;
vsec = text_offset / SECTOR_SIZE;
DEBUGEXTRA(("get_segment(0x%lx, 0x%lx, 0x%lx, 0x%lx)\n",
vsec, segsize, addr, limit));
if (!get_segment(&vsec, &segsize, &addr, limit)) return;
DEBUGEXTRA(("get_segment done vsec=0x%lx size=0x%lx "
"addr=0x%lx\n",
vsec, segsize, addr));
/* Read the data segment. */
addr = data_paddr;
segsize = (i32_t) data_filebytes;
vsec = data_offset / SECTOR_SIZE;
DEBUGEXTRA(("get_segment(0x%lx, 0x%lx, 0x%lx, 0x%lx)\n",
vsec, segsize, addr, limit));
if (!get_segment(&vsec, &segsize, &addr, limit)) return;
DEBUGEXTRA(("get_segment done vsec=0x%lx size=0x%lx "
"addr=0x%lx\n",
vsec, segsize, addr));
n = data_membytes - align(data_filebytes, click_size);
/* Zero out bss. */
DEBUGEXTRA(("\nraw_clear(0x%lx, 0x%lx); limit=0x%lx... ", addr, n, limit));
if (addr + n > limit) { errno= ENOMEM; return; }
raw_clear(addr, n);
DEBUGEXTRA(("done\n"));
addr+= n;
/* Check the kernel magic number. */
raw_copy(mon2abs(&kmagic),
data_paddr + MAGIC_OFF, sizeof(kmagic));
if (kmagic != KERNEL_D_MAGIC) {
printf("Kernel magic number is incorrect (0x%x@0x%lx)\n",
kmagic, data_paddr + MAGIC_OFF);
errno= 0;
return;
}
/* Translate the boot parameters to what Minix likes best. */
DEBUGEXTRA(("params2params(0x%x, 0x%x)... ", params, sizeof(params)));
if (!params2params(params, sizeof(params))) { errno= 0; return; }
DEBUGEXTRA(("done\n"));
/* Create multiboot info struct */
mbinfo = malloc(sizeof(multiboot_info_t));
if (mbinfo == nil) { errno= ENOMEM; return; }
memset(mbinfo, 0, sizeof(multiboot_info_t));
/* Module info structs start where kernel ends */
mbinfo->mods_addr = addr;
modstring = strdup(modules);
if (modstring == nil) {errno = ENOMEM; return; }
modstringlen = strlen(modules);
mbinfo->mods_count = split_module_list(modules);
mbmodinfo_size = sizeof(multiboot_module_t) * mbinfo->mods_count;
mbmodinfo = malloc(mbmodinfo_size);
if (mbmodinfo == nil) { errno= ENOMEM; return; }
addr+= mbmodinfo_size;
addr= align(addr, click_size);
mod_cmdline_start = mbinfo->mods_addr + sizeof(multiboot_module_t) *
mbinfo->mods_count;
raw_copy(mod_cmdline_start, mon2abs(modules),
modstringlen+1);
mbmodinfo[0].cmdline = mod_cmdline_start;
modnr = 1;
for (i= 0; i < modstringlen; ++i) {
if (modules[i] == '\0') {
mbmodinfo[modnr].cmdline = mod_cmdline_start + i + 1;
++modnr;
}
}
kernel_cmdline_start = mod_cmdline_start + modstringlen + 1;
mbinfo->cmdline = kernel_cmdline_start;
raw_copy(kernel_cmdline_start, mon2abs(kernel),
strlen(kernel)+1);
mbinfo->flags = MULTIBOOT_INFO_MODS|MULTIBOOT_INFO_CMDLINE|
MULTIBOOT_INFO_BOOTDEV|MULTIBOOT_INFO_MEMORY;
mbinfo->boot_device = mbdev;
mbinfo->mem_lower = mem[0].size/1024;
mbinfo->mem_upper = mem[1].size/1024;
for (i = 0, mod = strtok(modstring, " "); mod != nil;
mod = strtok(nil, " "), i++) {
mod = select_image(mod);
if (mod == nil) {errno = 0; return; }
mbmodinfo[i].mod_start = addr;
mbmodinfo[i].mod_end = addr + image_bytes;
mbmodinfo[i].pad = 0;
segsize= image_bytes;
vsec= 0;
DEBUGEXTRA(("get_segment(0x%lx, 0x%lx, 0x%lx, 0x%lx)\n",
vsec, segsize, addr, limit));
if (!get_segment(&vsec, &segsize, &addr, limit)) return;
DEBUGEXTRA(("get_segment done vsec=0x%lx size=0x%lx "
"addr=0x%lx\n",
vsec, segsize, addr));
addr+= segsize;
addr= align(addr, click_size);
}
free(modstring);
DEBUGEXTRA(("modinfo raw_copy: dst 0x%lx src 0x%lx sz 0x%lx\n",
mbinfo->mods_addr, mon2abs(mbmodinfo),
mbmodinfo_size));
raw_copy(mbinfo->mods_addr, mon2abs(mbmodinfo),
mbmodinfo_size);
free(mbmodinfo);
raw_copy(MULTIBOOT_INFO_ADDR, mon2abs(mbinfo),
sizeof(multiboot_info_t));
free(mbinfo);
/* Run the trailer function just before starting Minix. */
DEBUGEXTRA(("run_trailer()... "));
if (!run_trailer()) { errno= 0; return; }
DEBUGEXTRA(("done\n"));
/* Set the video to the required mode. */
if ((console= b_value("console")) == nil || (mode= a2x(console)) == 0) {
mode= strcmp(b_value("chrome"), "color") == 0 ? COLOR_MODE :
MONO_MODE;
}
DEBUGEXTRA(("set_mode(%d)... ", mode));
set_mode(mode);
DEBUGEXTRA(("done\n"));
/* Close the disk. */
DEBUGEXTRA(("dev_close()... "));
(void) dev_close();
DEBUGEXTRA(("done\n"));
/* Minix. */
cs = ds = text_paddr;
DEBUGEXTRA(("minix(0x%lx, 0x%lx, 0x%lx, 0x%x, 0x%x, 0x%lx)\n",
pc, cs, ds, params, sizeof(params), 0));
minix(pc, cs, ds, params, sizeof(params), 0);
if (!(k_flags & K_BRET)) {
extern u32_t reboot_code;
raw_copy(mon2abs(params), reboot_code, sizeof(params));
}
parse_code(params);
/* Return from Minix. Things may have changed, so assume nothing. */
fsok= -1;
errno= 0;
/* Read leftover character, if any. */
scan_keyboard();
/* Restore screen contents. */
restore_screen();
}
void bootminix(void)
/* Load Minix and run it. (Given the size of this program it is surprising
* that it ever gets to that.)
*/
{
char *image;
char *mb;
char *kernel;
/* FIXME: modules should come from environment */
char modules[] = "boot/ds boot/rs boot/pm boot/sched boot/vfs boot/memory boot/log boot/tty boot/mfs boot/vm boot/pfs boot/init";
if ((mb = b_value("mb")) != nil) {
do_multiboot = a2l(mb);
kernel = b_value("kernel");
if (kernel == nil) {
printf("kernel not set\n");
return;
}
}
if (do_multiboot) {
if ((kernel= select_image(b_value("kernel"))) == nil) return;
} else {
if ((image= select_image(b_value("image"))) == nil) return;
}
if(serial_line >= 0) {
char linename[2];
linename[0] = serial_line + '0';
linename[1] = '\0';
b_setvar(E_VAR, SERVARNAME, linename);
}
if (do_multiboot)
exec_mb(kernel, modules);
else
exec_image(image);
switch (errno) {
case ENOEXEC:
printf("%s contains a bad program header\n",
do_multiboot ? kernel : image);
break;
case ENOMEM:
printf("Not enough memory to load %s\n",
do_multiboot ? kernel : image);
break;
case EIO:
printf("Unexpected EOF on %s\n",
do_multiboot ? kernel : image);
case 0:
/* No error or error already reported. */;
}
if (do_multiboot)
free(kernel);
else
free(image);
if(serial_line >= 0)
b_unset(SERVARNAME);
}